Fix tests so they all pass.
First attempt ad Travis CI configuration file.

Skipping the UI tests for the moment.
Make insignificant change to activate Travis CI.
Import 'unittest' from traits compatibility layer.

So that tests run in Python 2.6 .
Make test robust to order of items in list.
Fix test to run with Python 2.6 .

UI is excluded for the moment.
Attempt at making Travis CI run UI tests using PyQt.
Only run UI tests on Python 2.7 using PyQt.

There is no easy way to install PyQt with Python 2.6 on Travis CI.
Travis CI did not pick up the ETS_TOOLKIT vlue from the script file.

Let's try this way instead.
Try to get Travis CI run the UI tests again.

I think I figured it out...
Merge branch 'travis-ui' into fix-tests
Merge pull request #22 from pberkes/fix-tests

Fix tests -- backward compatibility with 2.6, Travis CI configuration